GB1351464A - Bleaching of silver developed from silver halide emulsions - Google Patents
Bleaching of silver developed from silver halide emulsionsInfo
- Publication number
- GB1351464A GB1351464A GB942071*[A GB1351464DA GB1351464A GB 1351464 A GB1351464 A GB 1351464A GB 1351464D A GB1351464D A GB 1351464DA GB 1351464 A GB1351464 A GB 1351464A
- Authority
- GB
- United Kingdom
- Prior art keywords
- substituted
- azodicarbonamide
- silver
- bleaching
- alkyl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/40—Chemically transforming developed images
- G03C5/44—Bleaching; Bleach-fixing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
1351464 Bleaching photographically developed silver MINNESOTA MINING & MFG CO 13 April 1972 [14 April 1971] 9420/71 Heading G2C A process for bleaching photographically developed silver comprises contacting the silver with an aqueous solution containing azodicarbonamide and/or at least one substituted azodicarbonamide preferably having the following general formula in which R<SP>1</SP> to R<SP>4</SP> represent H, alkyl, cycloalkyl, substituted alkyl (e.g. alkoxyalkyl, hydroxyalkyl and alkyl substituted by a heterocyclic radicle), an unsaturated aliphatic group which may be substituted (e.g. allyl), aryl, substituted aryl (e.g. haloaryl, alkaryl and alkoxyaryl), heterocyclic or pairs of groups R<SP>1</SP> -R<SP>2</SP> and/or R<SP>3</SP>-R<SP>4</SP> complete a heterocyclic ring with the associated N atom, except that R<SP>1</SP> - R<SP>4</SP> do not all represent H. Preferably at least one of the amide nitrogen atoms is covalently bonded to a group having a centre of positive charge e.g. a quaternary ammonium grouping, the substituted azodicarbonamide having at least one negatively charged moiety e.g. I# or toluene - p - sulphonate, associated with it. The compounds given are the di-toluene - p - sulphonate and the di-iodide of N, N' - di (ethyl- 2- trimethylammonium) azodicarbonamide. The solution may also contain free halide ions, preferably Br<SP>-</SP>, and is buffered to a p H of 4 to 7 by, for example, sodium acetate/acetic acid. The solution may also contain a silver halide solvent compatible with the optionally substituted azodicarbonamide e. g. sodium thiocyanate.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB942071 | 1971-04-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1351464A true GB1351464A (en) | 1974-05-01 |
Family
ID=9871638
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB942071*[A Expired GB1351464A (en) | 1971-04-14 | 1971-04-14 | Bleaching of silver developed from silver halide emulsions |
Country Status (10)
Country | Link |
---|---|
US (1) | US3772018A (en) |
JP (1) | JPS5535695B1 (en) |
AR (1) | AR201420A1 (en) |
BE (1) | BE782177A (en) |
CA (1) | CA1001471A (en) |
CH (1) | CH591101A5 (en) |
DE (1) | DE2218189C2 (en) |
FR (1) | FR2133661B1 (en) |
GB (1) | GB1351464A (en) |
IT (1) | IT952635B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5731141A (en) * | 1995-06-16 | 1998-03-24 | Imation Corp. | Light-sensitive photographic materials comprising tabular silver halide grains and azodicarbonamide derivatives |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60142718A (en) * | 1983-12-29 | 1985-07-27 | Matsushita Electric Ind Co Ltd | Electronic ac voltage variable device |
JPS60142719A (en) * | 1983-12-29 | 1985-07-27 | Matsushita Electric Ind Co Ltd | Electronic ac voltage variable device |
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US10989138B2 (en) | 2017-03-30 | 2021-04-27 | Quest Engines, LLC | Internal combustion engine |
US10753308B2 (en) | 2017-03-30 | 2020-08-25 | Quest Engines, LLC | Internal combustion engine |
US10724428B2 (en) | 2017-04-28 | 2020-07-28 | Quest Engines, LLC | Variable volume chamber device |
WO2018204684A1 (en) | 2017-05-04 | 2018-11-08 | Quest Engines, LLC | Variable volume chamber for interaction with a fluid |
US11060636B2 (en) | 2017-09-29 | 2021-07-13 | Quest Engines, LLC | Engines and pumps with motionless one-way valve |
US11134335B2 (en) | 2018-01-26 | 2021-09-28 | Quest Engines, LLC | Audio source waveguide |
US10753267B2 (en) | 2018-01-26 | 2020-08-25 | Quest Engines, LLC | Method and apparatus for producing stratified streams |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH336527A (en) * | 1954-05-31 | 1959-02-28 | Ciba Geigy | Process for the production of new copper-containing disazo dyes |
US3655391A (en) * | 1969-05-16 | 1972-04-11 | Paoli Merli | Azodicarbonamide fog inhibitors |
GB1297653A (en) * | 1969-12-23 | 1972-11-29 |
-
1971
- 1971-04-14 GB GB942071*[A patent/GB1351464A/en not_active Expired
-
1972
- 1972-04-10 US US00242757A patent/US3772018A/en not_active Expired - Lifetime
- 1972-04-11 CA CA139,445A patent/CA1001471A/en not_active Expired
- 1972-04-13 FR FR7212911A patent/FR2133661B1/fr not_active Expired
- 1972-04-13 JP JP3651672A patent/JPS5535695B1/ja active Pending
- 1972-04-13 CH CH545672A patent/CH591101A5/xx not_active IP Right Cessation
- 1972-04-13 IT IT49595/72A patent/IT952635B/en active
- 1972-04-14 DE DE2218189A patent/DE2218189C2/en not_active Expired
- 1972-04-14 BE BE782177A patent/BE782177A/en not_active IP Right Cessation
- 1972-04-14 AR AR241488A patent/AR201420A1/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5731141A (en) * | 1995-06-16 | 1998-03-24 | Imation Corp. | Light-sensitive photographic materials comprising tabular silver halide grains and azodicarbonamide derivatives |
Also Published As
Publication number | Publication date |
---|---|
IT952635B (en) | 1973-07-30 |
DE2218189A1 (en) | 1972-11-02 |
CA1001471A (en) | 1976-12-14 |
BE782177A (en) | 1972-07-31 |
US3772018A (en) | 1973-11-13 |
CH591101A5 (en) | 1977-09-15 |
FR2133661A1 (en) | 1972-12-01 |
JPS5535695B1 (en) | 1980-09-16 |
FR2133661B1 (en) | 1976-08-06 |
DE2218189C2 (en) | 1981-12-10 |
AR201420A1 (en) | 1975-03-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |